This thesis is based on the following articles, which are referred to in the text by their Roman numerals.
I Kilpeläinen P & Hietala O (1994) Activation of rat brain ornithine decarboxylase by GTP. Biochem J 300: 577-582.
II Kilpeläinen P & Hietala O (1998) Mutation of aspartate-233 to valine in mouse ornithine decarboxylase reduces enzyme activity. Int J Biochem Cell B 30: 803-809
III Kilpeläinen P, Rybnikova E, Hietala O & Pelto-Huikko M (2000) Expression of ODC and its regulatory protein antizyme in the adult rat brain. J Neurosci Res 62:675-685.